80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/mm/mm_debug.c
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*
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* Copyright (C) 2019 Samsung Electronics
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*
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/oom.h>
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#include <linux/ratelimit.h>
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#include <trace/systrace_mark.h>
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#define MB_TO_PAGES(x) ((x) << (20 - PAGE_SHIFT))
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#define MIN_FILE_SIZE 300
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#define K(x) ((x) << (PAGE_SHIFT-10))
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static noinline void tracing_mark_write(int type, const char *str)
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{
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if (!tracing_is_on())
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return;
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switch (type) {
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case SYSTRACE_MARK_TYPE_BEGIN:
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trace_printk("B|%d|%s\n", current->tgid, str);
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break;
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case SYSTRACE_MARK_TYPE_END:
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trace_printk("E|%d|%s\n", current->tgid, str);
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break;
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default:
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break;
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}
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}
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void tracing_mark_write_helper(int type, const char *str)
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{
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tracing_mark_write(type, str);
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}
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static DEFINE_RATELIMIT_STATE(mm_debug_rs, 30 * HZ, 1);
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static unsigned long mm_debug_count(struct shrinker *s,
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struct shrink_control *sc)
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{
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unsigned long inactive_file, active_file, file;
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if (!__ratelimit(&mm_debug_rs))
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goto out;
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inactive_file = global_node_page_state(NR_INACTIVE_FILE);
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active_file = global_node_page_state(NR_ACTIVE_FILE);
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file = inactive_file + active_file;
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if (file < MB_TO_PAGES(MIN_FILE_SIZE)) {
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pr_info("mm_debug for low file size %lukB\n", K(file));
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show_mem(0, NULL);
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dump_tasks(NULL, NULL);
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}
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out:
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return 0; /* return 0 not to call to scan_objects */
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}
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static struct shrinker mm_debug_shrinker = {
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.count_objects = mm_debug_count,
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};
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static int __init mm_debug_init(void)
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{
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register_shrinker(&mm_debug_shrinker);
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return 0;
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}
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static void __exit mm_debug_exit(void)
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{
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unregister_shrinker(&mm_debug_shrinker);
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}
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module_init(mm_debug_init);
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module_exit(mm_debug_exit);
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